https://git.ruby-lang.org/ruby.git/commit/?id=fd6746c7a6

From fd6746c7a651d4a504073726d56be610e1081b78 Mon Sep 17 00:00:00 2001
From: aycabta <aycabta@g...>
Date: Sun, 9 Feb 2020 17:18:41 +0900
Subject: [ruby/readline-ext] Use require check instead of DONT_RUN_RELINE_TEST
 env

https://github.com/ruby/readline-ext/commit/1df99d1481

diff --git a/test/readline/helper.rb b/test/readline/helper.rb
index d5f0257..1b80327 100644
--- a/test/readline/helper.rb
+++ b/test/readline/helper.rb
@@ -9,8 +9,10 @@ def use_ext_readline # Use ext/readline as Readline https://github.com/ruby/ruby/blob/trunk/test/readline/helper.rb#L9
   Object.const_set(:Readline, ReadlineSo)
 end
 
-unless ENV['DONT_RUN_RELINE_TEST']
+begin
   require "reline"
+rescue LoadError
+else
   def use_lib_reline # Use lib/reline as Readline
     Reline.send(:remove_const, 'IOGate') if Reline.const_defined?('IOGate')
     Reline.const_set('IOGate', Reline::GeneralIO)
-- 
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